
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1998.
*
* The Initial Developer of the Original Code is
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/*
       Environment.java

       Wraps java.lang.System properties.

       by Patrick C. Beard <beard@netscape.com>
*/

package org.moyrax.javascript.shell;

import java.util.Enumeration;
import java.util.Properties;
import java.util.Vector;

import net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime;
import net.sourceforge.htmlunit.corejs.javascript.Scriptable;
import net.sourceforge.htmlunit.corejs.javascript.ScriptableObject;

/**
* Environment, intended to be instantiated at global scope, provides
* a natural way to access System properties from JavaScript.
*
* @author Patrick C. Beard
*/
public class Environment extends ScriptableObject
{
   static final long serialVersionUID = -430727378460177065L;

   private Environment thePrototypeInstance = null;

   public static void defineClass(ScriptableObject scope) {
       try {
           ScriptableObject.defineClass(scope, Environment.class);
       } catch (Exception e) {
           throw new Error(e.getMessage());
       }
   }

   public String getClassName() {
       return "Environment";
   }

   public Environment() {
       if (thePrototypeInstance == null)
           thePrototypeInstance = this;
   }

   public Environment(ScriptableObject scope) {
       setParentScope(scope);
       Object ctor = ScriptRuntime.getTopLevelProp(scope, "Environment");
       if (ctor != null && ctor instanceof Scriptable) {
           Scriptable s = (Scriptable) ctor;
           setPrototype((Scriptable) s.get("prototype", s));
       }
   }

   public boolean has(String name, Scriptable start) {
       if (this == thePrototypeInstance)
           return super.has(name, start);

       return (System.getProperty(name) != null);
   }

   public Object get(String name, Scriptable start) {
       if (this == thePrototypeInstance)
           return super.get(name, start);

       String result = System.getProperty(name);
       if (result != null)
           return ScriptRuntime.toObject(getParentScope(), result);
       else
           return Scriptable.NOT_FOUND;
   }

   public void put(String name, Scriptable start, Object value) {
       if (this == thePrototypeInstance)
           super.put(name, start, value);
       else
           System.getProperties().put(name, ScriptRuntime.toString(value));
   }

   @SuppressWarnings("unchecked")
  private Object[] collectIds() {
       Properties props = System.getProperties();
       Enumeration names = props.propertyNames();
       Vector keys = new Vector();
       while (names.hasMoreElements())
           keys.addElement(names.nextElement());
       Object[] ids = new Object[keys.size()];
       keys.copyInto(ids);
       return ids;
   }

   public Object[] getIds() {
       if (this == thePrototypeInstance)
           return super.getIds();
       return collectIds();
   }

   public Object[] getAllIds() {
       if (this == thePrototypeInstance)
           return super.getAllIds();
       return collectIds();
   }
}